Pounds per Square Inch (psi) – The Imperial Standard for Pressure

Thepounds per square inch (psi)is an imperial unit of pressure that quantifies the force exerted per square inch of area. It is widely used in the United States for measuring tire pressure, hydraulic systems, and other mechanical applications.

History & Background

Rooted in the imperial system, psi has been a practical unit for everyday and industrial measurements for centuries. Its use in automotive, aerospace, and construction industries makes it one of the most recognized units for pressure.

Conversion Factors

• 1 psi ≈ 6,894.76 Pa
• 1 psi ≈ 0.00689476 bar
• 1 psi ≈ 0.0689476 kPa
• 1 atm ≈ 14.696 psi

Applications

Psi is essential for determining tire inflation levels, hydraulic system performance, and pressure in gas cylinders. It is also commonly used in engineering to ensure safety and efficiency.

Interesting Facts

Many pressure gauges and sensors in the US display measurements in psi, making it a familiar unit for both professionals and consumers.

Conclusion

The pounds per square inch remains a vital unit in the imperial system, providing a practical and intuitive measure of pressure for everyday applications.